Truckers are sending ominous signs about the industrial economy, and investors are punishing them for it. Shares of trucking companies took a beating on Tuesday, WSJ Logistics Report’s Brian Baskin writes, amid signs that high retail inventories and a cooling industrial sector would cut into shipping demand for the rest of the year. The bleak outlook ran from the UPS earnings, which raised alarms over the less-than-truckload business at UPS Freight, to...